Optical Sheet Tabs for Narrow Bezel Backlight Assembly
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving a narrow bezel while maintaining the fixability of optical sheets, as narrowing the protrusion width of optical sheets increases their mobility and can lead to defects like white or black line defects, affecting display quality.
Innovation Solution
The implementation of a backlight assembly with optical sheets featuring first and second tabs that protrude perpendicular to their respective sides, which are accommodated and fixed by a mold frame, enhancing fixability and allowing for a narrower bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the width of the protrusion of the optical sheet is narrowed to implement a narrow bezel, then the bezel width is reduced, but the fixability of the optical sheet deteriorates and mobility increases
Solution Approach 1:
The optical sheet is segmented by adding protrusions (first and second protrusions) that extend from its surface. These protrusions are inserted into corresponding grooves in the mold frame, creating separate fixation points that secure the optical sheet without requiring a wide protrusion structure. This segmentation allows the bezel to be narrowed while maintaining reliable fixation through multiple discrete engagement points.
2Length of stationary object
If the width of the protrusion of the optical sheet is narrowed, then the bezel width is reduced, but white line defects or black line defects may occur which lower display quality
Solution Approach 1:
By segmenting the fixation structure into multiple protrusions and grooves, the optical sheet is securely positioned at multiple points, preventing the mobility that causes white line and black line defects. The segmented engagement ensures the optical sheet remains stable without requiring a wide protrusion that would increase bezel width.
Solution Approach 2:
The grooves in the mold frame act as intermediaries that receive and secure the protrusions from the optical sheet. This intermediary structure provides a stable connection between the optical sheet and the mold frame, preventing the optical sheet from shifting or becoming dislodged, thereby eliminating the conditions that lead to display defects while allowing for a narrow bezel design.
Data Source
AI summary
A backlight assembly and display device having the same. The backlight assembly may include a light source, a light guide formed at one side of the light source, at least one optical sheet disposed on the light guide and have first to fourth sides and first to fourth corners and a mold frame which accommodates and fixes the optical sheet, wherein the optical sheet includes a first tab which protrudes in a same plane as the optical sheet and in a direction perpendicular to the second side while being adjacent to the second corner, and a second tab which protrudes in the same plane as the optical sheet and in a direction perpendicular to the third side and is disposed to be between and spaced apart from the third corner and the fourth corner.